karenknight9
GLK Diesel Check Engine Light and Rough Idle
Summary of the thread
A 2015 GLK Diesel experienced a check engine light, rough idle, stalling, reduced fuel efficiency, and power loss after a fuel filter change. The issues were suspected to be related to the fuel pressure regulator or pressure sensor. After consulting with others who had similar experiences, it was determined that the problem was indeed a defective fuel pressure regulator, which was confirmed and resolved by a workshop, restoring the vehicle's performance.
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4 comment(s)
karenknight9 (community.author)
Good point about the fuel rail. What exactly do you mean by 'pressure drop', and how did you diagnose that on your GLK? Does it need special tools?
helmutblaze1
By pressure drop, I mean the fuel pressure isn't staying consistent, causing the engine to run poorly. The car needs a certain fuel pressure to run right. I didn't actually diagnose it myself. Took it to a workshop, and they found an error entry related to the fuel pressure regulator after the fuel filter change. They checked the fuel rail and pressure sensor but said it was a defective fuel pressure regulator.
karenknight9 (community.author)
Thanks for the info. Took it to a shop, and you were spot on it was the fuel pressure regulator. Apparently, there was an error entry after changing the fuel filter. New one cost me about 45€. Runs like new now!
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MERCEDES
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GLK
helmutblaze1
Sounds familiar. I had similar issues with my GLK after a fuel filter change too. Check engine light, rough idle, the whole shebang. Could be a pressure drop in the fuel rail. Did you make sure everything was properly seated when you replaced the filter? Its a long shot, but might be worth inspecting it again.